| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.wifi; |
| |
| import android.content.pm.UserInfo; |
| import android.net.IpConfiguration; |
| import android.net.StaticIpConfiguration; |
| import android.net.wifi.WifiConfiguration; |
| import android.net.wifi.WifiEnterpriseConfig; |
| import android.net.wifi.WifiScanner; |
| import android.os.UserHandle; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.server.wifi.util.NativeUtil; |
| |
| import java.security.cert.X509Certificate; |
| import java.util.Arrays; |
| import java.util.BitSet; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * WifiConfiguration utility for any {@link android.net.wifi.WifiConfiguration} related operations. |
| * Currently contains: |
| * > Helper method to check if the WifiConfiguration object is visible to the provided users. |
| * > Helper methods to identify the encryption of a WifiConfiguration object. |
| */ |
| public class WifiConfigurationUtil { |
| private static final String TAG = "WifiConfigurationUtil"; |
| |
| /** |
| * Constants used for validating external config objects. |
| */ |
| private static final int ENCLOSING_QUTOES_LEN = 2; |
| private static final int SSID_ASCII_MIN_LEN = 1 + ENCLOSING_QUTOES_LEN; |
| private static final int SSID_ASCII_MAX_LEN = 32 + ENCLOSING_QUTOES_LEN; |
| private static final int SSID_HEX_MIN_LEN = 2; |
| private static final int SSID_HEX_MAX_LEN = 64; |
| private static final int PSK_ASCII_MIN_LEN = 8 + ENCLOSING_QUTOES_LEN; |
| private static final int PSK_ASCII_MAX_LEN = 63 + ENCLOSING_QUTOES_LEN; |
| private static final int PSK_HEX_LEN = 64; |
| @VisibleForTesting |
| public static final String PASSWORD_MASK = "*"; |
| |
| /** |
| * Check whether a network configuration is visible to a user or any of its managed profiles. |
| * |
| * @param config the network configuration whose visibility should be checked |
| * @param profiles the user IDs of the user itself and all its managed profiles (can be obtained |
| * via {@link android.os.UserManager#getProfiles}) |
| * @return whether the network configuration is visible to the user or any of its managed |
| * profiles |
| */ |
| public static boolean isVisibleToAnyProfile(WifiConfiguration config, List<UserInfo> profiles) { |
| return (config.shared || doesUidBelongToAnyProfile(config.creatorUid, profiles)); |
| } |
| |
| /** |
| * Check whether a uid belong to a user or any of its managed profiles. |
| * |
| * @param uid uid of the app. |
| * @param profiles the user IDs of the user itself and all its managed profiles (can be obtained |
| * via {@link android.os.UserManager#getProfiles}) |
| * @return whether the uid belongs to the user or any of its managed profiles. |
| */ |
| public static boolean doesUidBelongToAnyProfile(int uid, List<UserInfo> profiles) { |
| final int userId = UserHandle.getUserId(uid); |
| for (UserInfo profile : profiles) { |
| if (profile.id == userId) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if the provided |wepKeys| array contains any non-null value; |
| */ |
| public static boolean hasAnyValidWepKey(String[] wepKeys) { |
| for (int i = 0; i < wepKeys.length; i++) { |
| if (wepKeys[i] != null) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Helper method to check if the provided |config| corresponds to a PSK network or not. |
| */ |
| public static boolean isConfigForPskNetwork(WifiConfiguration config) { |
| return config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_PSK); |
| } |
| |
| /** |
| * Helper method to check if the provided |config| corresponds to a EAP network or not. |
| */ |
| public static boolean isConfigForEapNetwork(WifiConfiguration config) { |
| return (config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_EAP) |
| || config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.IEEE8021X)); |
| } |
| |
| /** |
| * Helper method to check if the provided |config| corresponds to a WEP network or not. |
| */ |
| public static boolean isConfigForWepNetwork(WifiConfiguration config) { |
| return (config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.NONE) |
| && hasAnyValidWepKey(config.wepKeys)); |
| } |
| |
| /** |
| * Helper method to check if the provided |config| corresponds to an open network or not. |
| */ |
| public static boolean isConfigForOpenNetwork(WifiConfiguration config) { |
| return !(isConfigForWepNetwork(config) || isConfigForPskNetwork(config) |
| || isConfigForEapNetwork(config)); |
| } |
| |
| /** |
| * Compare existing and new WifiConfiguration objects after a network update and return if |
| * IP parameters have changed or not. |
| * |
| * @param existingConfig Existing WifiConfiguration object corresponding to the network. |
| * @param newConfig New WifiConfiguration object corresponding to the network. |
| * @return true if IP parameters have changed, false otherwise. |
| */ |
| public static boolean hasIpChanged(WifiConfiguration existingConfig, |
| WifiConfiguration newConfig) { |
| if (existingConfig.getIpAssignment() != newConfig.getIpAssignment()) { |
| return true; |
| } |
| if (newConfig.getIpAssignment() == IpConfiguration.IpAssignment.STATIC) { |
| return !Objects.equals(existingConfig.getStaticIpConfiguration(), |
| newConfig.getStaticIpConfiguration()); |
| } |
| return false; |
| } |
| |
| /** |
| * Compare existing and new WifiConfiguration objects after a network update and return if |
| * proxy parameters have changed or not. |
| * |
| * @param existingConfig Existing WifiConfiguration object corresponding to the network. |
| * @param newConfig New WifiConfiguration object corresponding to the network. |
| * @return true if proxy parameters have changed, false if no existing config and proxy settings |
| * are NONE, false otherwise. |
| */ |
| public static boolean hasProxyChanged(WifiConfiguration existingConfig, |
| WifiConfiguration newConfig) { |
| if (existingConfig == null) { |
| return newConfig.getProxySettings() != IpConfiguration.ProxySettings.NONE; |
| } |
| if (newConfig.getProxySettings() != existingConfig.getProxySettings()) { |
| return true; |
| } |
| return !Objects.equals(existingConfig.getHttpProxy(), newConfig.getHttpProxy()); |
| } |
| |
| /** |
| * Compare existing and new WifiEnterpriseConfig objects after a network update and return if |
| * credential parameters have changed or not. |
| * |
| * @param existingEnterpriseConfig Existing WifiConfiguration object corresponding to the |
| * network. |
| * @param newEnterpriseConfig New WifiConfiguration object corresponding to the network. |
| * @return true if credentials have changed, false otherwise. |
| */ |
| @VisibleForTesting |
| public static boolean hasEnterpriseConfigChanged(WifiEnterpriseConfig existingEnterpriseConfig, |
| WifiEnterpriseConfig newEnterpriseConfig) { |
| if (existingEnterpriseConfig != null && newEnterpriseConfig != null) { |
| if (existingEnterpriseConfig.getEapMethod() != newEnterpriseConfig.getEapMethod()) { |
| return true; |
| } |
| if (existingEnterpriseConfig.getPhase2Method() |
| != newEnterpriseConfig.getPhase2Method()) { |
| return true; |
| } |
| if (!TextUtils.equals(existingEnterpriseConfig.getIdentity(), |
| newEnterpriseConfig.getIdentity()) |
| || !TextUtils.equals(existingEnterpriseConfig.getAnonymousIdentity(), |
| newEnterpriseConfig.getAnonymousIdentity())) { |
| return true; |
| } |
| if (!TextUtils.equals(existingEnterpriseConfig.getPassword(), |
| newEnterpriseConfig.getPassword())) { |
| return true; |
| } |
| X509Certificate[] existingCaCerts = existingEnterpriseConfig.getCaCertificates(); |
| X509Certificate[] newCaCerts = newEnterpriseConfig.getCaCertificates(); |
| if (!Arrays.equals(existingCaCerts, newCaCerts)) { |
| return true; |
| } |
| } else { |
| // One of the configs may have an enterpriseConfig |
| if (existingEnterpriseConfig != null || newEnterpriseConfig != null) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Compare existing and new WifiConfiguration objects after a network update and return if |
| * credential parameters have changed or not. |
| * |
| * @param existingConfig Existing WifiConfiguration object corresponding to the network. |
| * @param newConfig New WifiConfiguration object corresponding to the network. |
| * @return true if credentials have changed, false otherwise. |
| */ |
| public static boolean hasCredentialChanged(WifiConfiguration existingConfig, |
| WifiConfiguration newConfig) { |
| if (!Objects.equals(existingConfig.allowedKeyManagement, |
| newConfig.allowedKeyManagement)) { |
| return true; |
| } |
| if (!Objects.equals(existingConfig.allowedProtocols, newConfig.allowedProtocols)) { |
| return true; |
| } |
| if (!Objects.equals(existingConfig.allowedAuthAlgorithms, |
| newConfig.allowedAuthAlgorithms)) { |
| return true; |
| } |
| if (!Objects.equals(existingConfig.allowedPairwiseCiphers, |
| newConfig.allowedPairwiseCiphers)) { |
| return true; |
| } |
| if (!Objects.equals(existingConfig.allowedGroupCiphers, |
| newConfig.allowedGroupCiphers)) { |
| return true; |
| } |
| if (!Objects.equals(existingConfig.preSharedKey, newConfig.preSharedKey)) { |
| return true; |
| } |
| if (!Arrays.equals(existingConfig.wepKeys, newConfig.wepKeys)) { |
| return true; |
| } |
| if (existingConfig.wepTxKeyIndex != newConfig.wepTxKeyIndex) { |
| return true; |
| } |
| if (existingConfig.hiddenSSID != newConfig.hiddenSSID) { |
| return true; |
| } |
| if (hasEnterpriseConfigChanged(existingConfig.enterpriseConfig, |
| newConfig.enterpriseConfig)) { |
| return true; |
| } |
| return false; |
| } |
| |
| private static boolean validateSsid(String ssid, boolean isAdd) { |
| if (isAdd) { |
| if (ssid == null) { |
| Log.e(TAG, "validateSsid : null string"); |
| return false; |
| } |
| } else { |
| if (ssid == null) { |
| // This is an update, so the SSID can be null if that is not being changed. |
| return true; |
| } |
| } |
| if (ssid.isEmpty()) { |
| Log.e(TAG, "validateSsid failed: empty string"); |
| return false; |
| } |
| if (ssid.startsWith("\"")) { |
| // ASCII SSID string |
| if (ssid.length() < SSID_ASCII_MIN_LEN) { |
| Log.e(TAG, "validateSsid failed: ascii string size too small: " + ssid.length()); |
| return false; |
| } |
| if (ssid.length() > SSID_ASCII_MAX_LEN) { |
| Log.e(TAG, "validateSsid failed: ascii string size too large: " + ssid.length()); |
| return false; |
| } |
| } else { |
| // HEX SSID string |
| if (ssid.length() < SSID_HEX_MIN_LEN) { |
| Log.e(TAG, "validateSsid failed: hex string size too small: " + ssid.length()); |
| return false; |
| } |
| if (ssid.length() > SSID_HEX_MAX_LEN) { |
| Log.e(TAG, "validateSsid failed: hex string size too large: " + ssid.length()); |
| return false; |
| } |
| } |
| try { |
| NativeUtil.decodeSsid(ssid); |
| } catch (IllegalArgumentException e) { |
| Log.e(TAG, "validateSsid failed: malformed string: " + ssid); |
| return false; |
| } |
| return true; |
| } |
| |
| private static boolean validatePsk(String psk, boolean isAdd) { |
| if (isAdd) { |
| if (psk == null) { |
| Log.e(TAG, "validatePsk: null string"); |
| return false; |
| } |
| } else { |
| if (psk == null) { |
| // This is an update, so the psk can be null if that is not being changed. |
| return true; |
| } else if (psk.equals(PASSWORD_MASK)) { |
| // This is an update, so the app might have returned back the masked password, let |
| // it thru. WifiConfigManager will handle it. |
| return true; |
| } |
| } |
| if (psk.isEmpty()) { |
| Log.e(TAG, "validatePsk failed: empty string"); |
| return false; |
| } |
| if (psk.startsWith("\"")) { |
| // ASCII PSK string |
| if (psk.length() < PSK_ASCII_MIN_LEN) { |
| Log.e(TAG, "validatePsk failed: ascii string size too small: " + psk.length()); |
| return false; |
| } |
| if (psk.length() > PSK_ASCII_MAX_LEN) { |
| Log.e(TAG, "validatePsk failed: ascii string size too large: " + psk.length()); |
| return false; |
| } |
| } else { |
| // HEX PSK string |
| if (psk.length() != PSK_HEX_LEN) { |
| Log.e(TAG, "validatePsk failed: hex string size mismatch: " + psk.length()); |
| return false; |
| } |
| } |
| try { |
| NativeUtil.hexOrQuotedStringToBytes(psk); |
| } catch (IllegalArgumentException e) { |
| Log.e(TAG, "validatePsk failed: malformed string: " + psk); |
| return false; |
| } |
| return true; |
| } |
| |
| private static boolean validateKeyMgmt(BitSet keyMgmnt) { |
| if (keyMgmnt == null) { |
| Log.e(TAG, "validateKeyMgmt failed: null bitset"); |
| return false; |
| } |
| if (keyMgmnt.cardinality() > 1) { |
| if (keyMgmnt.cardinality() != 2) { |
| Log.e(TAG, "validateKeyMgmt failed: cardinality != 2"); |
| return false; |
| } |
| if (!keyMgmnt.get(WifiConfiguration.KeyMgmt.WPA_EAP)) { |
| Log.e(TAG, "validateKeyMgmt failed: not WPA_EAP"); |
| return false; |
| } |
| if (!keyMgmnt.get(WifiConfiguration.KeyMgmt.IEEE8021X) |
| && !keyMgmnt.get(WifiConfiguration.KeyMgmt.WPA_PSK)) { |
| Log.e(TAG, "validateKeyMgmt failed: not PSK or 8021X"); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private static boolean validateIpConfiguration(IpConfiguration ipConfig) { |
| if (ipConfig == null) { |
| Log.e(TAG, "validateIpConfiguration failed: null IpConfiguration"); |
| return false; |
| } |
| if (ipConfig.getIpAssignment() == IpConfiguration.IpAssignment.STATIC) { |
| StaticIpConfiguration staticIpConfig = ipConfig.getStaticIpConfiguration(); |
| if (staticIpConfig == null) { |
| Log.e(TAG, "validateIpConfiguration failed: null StaticIpConfiguration"); |
| return false; |
| } |
| if (staticIpConfig.ipAddress == null) { |
| Log.e(TAG, "validateIpConfiguration failed: null static ip Address"); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Enums to specify if the provided config is being validated for add or update. |
| */ |
| public static final boolean VALIDATE_FOR_ADD = true; |
| public static final boolean VALIDATE_FOR_UPDATE = false; |
| |
| /** |
| * Validate the configuration received from an external application. |
| * |
| * This method checks for the following parameters: |
| * 1. {@link WifiConfiguration#SSID} |
| * 2. {@link WifiConfiguration#preSharedKey} |
| * 3. {@link WifiConfiguration#allowedKeyManagement} |
| * 4. {@link WifiConfiguration#getIpConfiguration()} |
| * |
| * @param config {@link WifiConfiguration} received from an external application. |
| * @param isAdd {@link #VALIDATE_FOR_ADD} to indicate a network config received for an add, |
| * {@link #VALIDATE_FOR_UPDATE} for a network config received for an update. |
| * These 2 cases need to be handled differently because the config received for an |
| * update could contain only the fields that are being changed. |
| * @return true if the parameters are valid, false otherwise. |
| */ |
| public static boolean validate(WifiConfiguration config, boolean isAdd) { |
| if (!validateSsid(config.SSID, isAdd)) { |
| return false; |
| } |
| if (!validateKeyMgmt(config.allowedKeyManagement)) { |
| return false; |
| } |
| if (config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_PSK) |
| && !validatePsk(config.preSharedKey, isAdd)) { |
| return false; |
| } |
| if (!validateIpConfiguration(config.getIpConfiguration())) { |
| return false; |
| } |
| // TBD: Validate some enterprise params as well in the future here. |
| return true; |
| } |
| |
| /** |
| * Check if the provided two networks are the same. |
| * Note: This does not check if network selection BSSID's are the same. |
| * |
| * @param config Configuration corresponding to a network. |
| * @param config1 Configuration corresponding to another network. |
| * |
| * @return true if |config| and |config1| are the same network. |
| * false otherwise. |
| */ |
| public static boolean isSameNetwork(WifiConfiguration config, WifiConfiguration config1) { |
| if (config == null && config1 == null) { |
| return true; |
| } |
| if (config == null || config1 == null) { |
| return false; |
| } |
| if (config.networkId != config1.networkId) { |
| return false; |
| } |
| if (!Objects.equals(config.SSID, config1.SSID)) { |
| return false; |
| } |
| if (WifiConfigurationUtil.hasCredentialChanged(config, config1)) { |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Create a PnoNetwork object from the provided WifiConfiguration. |
| * |
| * @param config Configuration corresponding to the network. |
| * @param newPriority New priority to be assigned to the network. |
| * @return PnoNetwork object corresponding to the network. |
| */ |
| public static WifiScanner.PnoSettings.PnoNetwork createPnoNetwork( |
| WifiConfiguration config, int newPriority) { |
| WifiScanner.PnoSettings.PnoNetwork pnoNetwork = |
| new WifiScanner.PnoSettings.PnoNetwork(config.SSID); |
| if (config.hiddenSSID) { |
| pnoNetwork.flags |= WifiScanner.PnoSettings.PnoNetwork.FLAG_DIRECTED_SCAN; |
| } |
| pnoNetwork.flags |= WifiScanner.PnoSettings.PnoNetwork.FLAG_A_BAND; |
| pnoNetwork.flags |= WifiScanner.PnoSettings.PnoNetwork.FLAG_G_BAND; |
| if (config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_PSK)) { |
| pnoNetwork.authBitField |= WifiScanner.PnoSettings.PnoNetwork.AUTH_CODE_PSK; |
| } else if (config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_EAP) |
| || config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.IEEE8021X)) { |
| pnoNetwork.authBitField |= WifiScanner.PnoSettings.PnoNetwork.AUTH_CODE_EAPOL; |
| } else { |
| pnoNetwork.authBitField |= WifiScanner.PnoSettings.PnoNetwork.AUTH_CODE_OPEN; |
| } |
| return pnoNetwork; |
| } |
| |
| |
| /** |
| * General WifiConfiguration list sorting algorithm: |
| * 1, Place the fully enabled networks first. |
| * 2. Next place all the temporarily disabled networks. |
| * 3. Place the permanently disabled networks last (Permanently disabled networks are removed |
| * before WifiConfigManager uses this comparator today!). |
| * |
| * Among the networks with the same status, sort them in the order determined by the return of |
| * {@link #compareNetworksWithSameStatus(WifiConfiguration, WifiConfiguration)} method |
| * implementation. |
| */ |
| public abstract static class WifiConfigurationComparator implements |
| Comparator<WifiConfiguration> { |
| private static final int ENABLED_NETWORK_SCORE = 3; |
| private static final int TEMPORARY_DISABLED_NETWORK_SCORE = 2; |
| private static final int PERMANENTLY_DISABLED_NETWORK_SCORE = 1; |
| |
| @Override |
| public int compare(WifiConfiguration a, WifiConfiguration b) { |
| int configAScore = getNetworkStatusScore(a); |
| int configBScore = getNetworkStatusScore(b); |
| if (configAScore == configBScore) { |
| return compareNetworksWithSameStatus(a, b); |
| } else { |
| return Integer.compare(configBScore, configAScore); |
| } |
| } |
| |
| // This needs to be implemented by the connected/disconnected PNO list comparator. |
| abstract int compareNetworksWithSameStatus(WifiConfiguration a, WifiConfiguration b); |
| |
| /** |
| * Returns an integer representing a score for each configuration. The scores are assigned |
| * based on the status of the configuration. The scores are assigned according to the order: |
| * Fully enabled network > Temporarily disabled network > Permanently disabled network. |
| */ |
| private int getNetworkStatusScore(WifiConfiguration config) { |
| if (config.getNetworkSelectionStatus().isNetworkEnabled()) { |
| return ENABLED_NETWORK_SCORE; |
| } else if (config.getNetworkSelectionStatus().isNetworkTemporaryDisabled()) { |
| return TEMPORARY_DISABLED_NETWORK_SCORE; |
| } else { |
| return PERMANENTLY_DISABLED_NETWORK_SCORE; |
| } |
| } |
| } |
| } |
